This work presents an experimental and numerical study of a non-homogeneous acoustic treatment based on space-coiling unit cells. A modular phase gradient metasurface is used in the experimental analysis as a wall lining in a Grazing Impedance Tube. A metacontinuum reduced order model of the cells is used in FEM simulations to predict the experimental results. The experiments and the numerical analysis show a good agreement in terms of the predicted transmission coefficient spectrum for the selected benchmark problem. Although not optimized, the non-homogeneous acoustic treatment showed remarkable transmission loss in a wide range of frequencies, which can be explained by a subwavelength distribution of acoustic resonators with different resonance frequencies.
Palma, G., Flanagan, L., Burghignoli, L., Kennedy, J. (2023). NUMERICAL AND EXPERIMENTAL INVESTIGATION OF A PHASE GRADIENT METASURFACE LINING. In Proceedings of Forum Acusticum. European Acoustics Association, EAA.
NUMERICAL AND EXPERIMENTAL INVESTIGATION OF A PHASE GRADIENT METASURFACE LINING
Palma Giorgio
;Burghignoli L.;
2023-01-01
Abstract
This work presents an experimental and numerical study of a non-homogeneous acoustic treatment based on space-coiling unit cells. A modular phase gradient metasurface is used in the experimental analysis as a wall lining in a Grazing Impedance Tube. A metacontinuum reduced order model of the cells is used in FEM simulations to predict the experimental results. The experiments and the numerical analysis show a good agreement in terms of the predicted transmission coefficient spectrum for the selected benchmark problem. Although not optimized, the non-homogeneous acoustic treatment showed remarkable transmission loss in a wide range of frequencies, which can be explained by a subwavelength distribution of acoustic resonators with different resonance frequencies.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.